diff --git a/pom.xml b/pom.xml
index c3a080f..650e321 100644
--- a/pom.xml
+++ b/pom.xml
@@ -198,7 +198,10 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-javadoc-plugin</artifactId>
-                        <version>3.1.0</version>
+                        <version>3.1.1</version>
+                        <configuration>
+                            <source>1.8</source>
+                        </configuration>
                         <executions>
                             <execution>
                                 <id>attach-javadocs</id>